Tagged Questions

I've got an Canon 85mm f1.8 for sport photography and portraits.
Testing it doesn't make me smile. I get backfocus at f1.8 and f2.8, but front focus at 2.0 and 2.2. This varies at different distances. ...

I have a problem: Back-focus of my lens is not constant so it is not possible to calibrate it using AF fine tuning.
I have body Nikon D7000 and the lens is Nikkor 50mm f/1.8 D. I've bought the lens ...

I’ve just gone through a round of testing with two telephoto zooms, on two different cameras, and both appear to have significant back focus issues at the 70mm end.
I just had the Nikon 70-200 f/2.8 ...

I know that sometimes a lens/body combo needs to be micro-adjusted to attain ideal focusing behavior, and that this is usually because of sample variation, but which parts of the lens and/or body are ...

I have Canon EOS 450D, and it seems, that camera have problem with autofocusing, when i'm looking through optical viewfinder. If I switch camera to liveview - autofocus works correctly, but slow.
The ...

I've read those terms in a couple of lens reviews, and not even Wikipedia has an article about it.
So my questions are:
What is back/frontfocus?
What causes back/frontfocus?
Is there any preventive ...

I have a Canon 7D with a 50mm f/1.4 lens, and I think the auto-focus of the lens is off. How can I test and adjust this reliably?
Will this approach work with all of my lenses? If I had a different ...